Inertia Forces in Reciprocating Parts topics include: Kliens, bennetts and ritterhaus construction, velocity and acceleration of engines, reciprocating parts of engines. Inertia forces in reciprocating parts are caused by the oscillation of reciprocating masses. These forces act along the line of stroke and through the cross head on the structures and on the main bearing of the crankshaft.  The inertia force due to the acceleration of the reciprocating parts opposes the force on the piston. The inertia force due to retardation of the reciprocating parts helps the force on the piston.  The... Show more

Inertia Forces in Reciprocating Parts topics include: Kliens, bennetts and ritterhaus construction, velocity and acceleration of engines, reciprocating parts of engines.

Inertia forces in reciprocating parts are caused by the oscillation of reciprocating masses. These forces act along the line of stroke and through the cross head on the structures and on the main bearing of the crankshaft. 

The inertia force due to the acceleration of the reciprocating parts opposes the force on the piston. The inertia force due to retardation of the reciprocating parts helps the force on the piston. 
The inertial force of mass can be calculated by multiplying the object's mass by its acceleration. 
Balancing is a method of correcting or eliminating unwanted inertia forces and couples in rotating and reciprocating parts of the machine.

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Machine Dynamics Practice Test: Inertia Forces in Reciprocating Parts

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25 Questions

1. When the acceleration of the piston is 0, then the velocity is _____

NegativeMinimumHalf the maximumMaximum

2. Klein’s constructions can be used to determine the acceleration of various parts at all locations.

FalseMaybeTrueDon't Know

3. From figure, what is the absolute velocity of P, i.e velocity of P with respect to the stationary point O?

ω × OCω × OMω × CMω × QN

4. If the crank and the connecting rod are 300 mm and 1 m long respectively and the crank rotates at a constant speed of 250 r.p.m., determine the crank angle at which the maximum velocity occurs is ____

45609075

5. Ritterhaus’ construction is used to determine graphically the velocity and acceleration of reciprocating parts of an IC engine.

FalseTrueMaybeDon't Know

6. Why the inertia torque acts in the opposite direction to the accelerating couple?

To reduce the accelerating torqueBring the body in equilibriumActs as a constraint torqueIncrease the linear acceleration

7. In given figure, Triangle OCM is known as ________

Bennet’s diagramKlein’s displacement diagramKlein’s velocity diagramKlein’s acceleration diagram

8. From the data given:
Crank and connecting rod of a steam engine are 0.3 m and 1.5 m in length; The crank rotates at 150 r.p.m. clockwise.
Determine the acceleration in m/s² of the piston for the same position(angle 40 degrees from IDC).

50.4155.2559.2765.3

9. Bennett’ construction is used when the motion of the crank is linear cycloidal.

FalseTrueDon't KnowMaybe

10. In a horizontal engine, reciprocating parts are retarded when the piston moves from _________

Midway to TDCBDC to midwayBDC to TDCTDC to BDC

11. For a slider crank mechanism, the total no. of dead centres are _____

2310

12. From figure, acceleration of P with respect to C is given by_________

ω2.OMω2.PCω2.QNω2.CN

13. Acceleration of any point D on the connecting rod is given by ________

ω2.OD2ω2.PDω2.OD1ω2.OD

14. Inertia torque acts in the same direction as the accelerating couple?

MaybeTrueDon't KnowFalse

15. In which of the following cases Ritterhaus’ construction can be used?

When the motion is SHMCrank has a uniform angular accelerationLever has a uniform angular accelerationCrank has a uniform angular velocity

16. Bennett’ construction is used to determine graphically the velocity and acceleration of reciprocating parts of an IC engine.

TrueDon't KnowFalseMaybe

17. From figure, what is the velocity of P with respect to C?

ω × OCω × CMω × QNω × OM

18. If OC is the crank and PC is the connecting rod of a reciprocating steam engine and rotates with uniform angular velocity in clockwise direction in the given figure below: then under which condition the piston will undergo retardation?

N is below ON is above ON lies to the left of ON lies to the right of O

19. A body remains in equilibrium if ________

Inertia force is applied in the direction Parallel to the resultant forceInertia force is applied in the same direction to the resultant forceInertia force is applied in the direction Perpendicular to the resultant forceInertia force is applied in the direction opposite to the resultant force

20. In the following picture the G is the center of gravity, the quantity h is known as the “offset”. I is the moment of inertia and k is the radius of gyration. Offset’s value is given by?

I.α/m.gI/m.kI.α/Fm.k/I

21. From figure, what is the absolute velocity of P, i.e velocity of P with respect to the stationary point O?

ω × OMω × OCω × CMω × QN

22. In a slider crank mechanism, the length of the crank and connecting rod are 150 mm and 600 mm respectively. The crank position is 60° from inner dead centre. The crank shaft speed is 400 r.p.m. (clockwise). Velocity of the slider is ________

6.66 m/s6.12 m/s7.32 m/s6.9 m/s

23. If the crank and the connecting rod are 600 mm and 2 m long respectively and the crank rotates at a constant speed of 250 r.p.m, determine maximum velocity of the piston in m/s is _____

1517.52010.5

24. In the presence of frictional resistance, the expression for piston effort is _________

F(L) – F(I) + R(f)F(L) – F(I)F(L) ± F(I) – R(f)F(L) + F(I)

25. If OC is the crank and PC is the connecting rod rotating in clockwise direction in the figure given below, then triangle OCM is known as ________

Ritterhaus’ acceleration diagramRitterhaus’ velocity diagramKlein’s acceleration diagramKlein’s velocity diagram